79865501 has 2 divisors, whose sum is σ = 79865502. Its totient is φ = 79865500.

The previous prime is 79865483. The next prime is 79865503. The reversal of 79865501 is 10556897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61246276 + 18619225 = 7826^2 + 4315^2 .

It is a cyclic number.

It is not a de Polignac number, because 79865501 - 2⁶ = 79865437 is a prime.

Together with 79865503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79865503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39932750 + 39932751.

It is an arithmetic number, because the mean of its divisors is an integer number (39932751).

Almost surely, 2^79865501 is an apocalyptic number.

It is an amenable number.

79865501 is a deficient number, since it is larger than the sum of its proper divisors (1).

79865501 is an equidigital number, since it uses as much as digits as its factorization.

79865501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 79865501 is about 8936.7500244776. The cubic root of 79865501 is about 430.6453281284.

The spelling of 79865501 in words is "seventy-nine million, eight hundred sixty-five thousand, five hundred one".